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Carcass Characteristics and Profitability Analysis Based on Slaughter Age of Hanwoo Steers
( Sang Cheol Lee ),( Hyun Ho Choi ),( Jeong Seop Shin ),( Kyoung Hoon Kim ),( Young Kyoon Oh ),( Dong Won Cheon ) 한국동물자원과학회(구 한국축산학회) 2013 한국축산학회지 Vol.55 No.4
This study analyzed optimal slaughter ages and carcass traits to investigate factors that affect farm incomes. Carcass characteristics and economical analysis of 81 Hanwoo steers previously tested(Expt. 1) and 5,826 steers from Gangwon-Do, area A(Expt. 2) were used. In Expt. 1, the strongest relationship was between the slaughter age and the carcass weight based on the R2 value, and the weakest relationship was between the slaughter age and the marbling score based on the R2. The slaughter age, marbling score, and rib-eye area of steers slaughtered from 26 to 31 months of age had a positive effect on income, but back fat thickness had a negative effect. In the economical analysis of Expt. 1, the optimal time for slaughter was 31 months of age. In Expt. 2, composed of steers slaughtered from 26 to 35 months of age in farms site of area A, the income was highest from steers slaughtered at 28 months of age, after which the income decreased. From the results of Expt. 1 and 2, it is evident that the optimal slaughter age of Hanwoo steers is affected by the genetic differences of calves, the feeding program and management, fattening skills, or carcass price. In order to improve the income of individual farms, the slaughter age must be precisely decided by understanding the exact relationship between the feeding cost of Hanwoo steers and slaughter results, such as carcass weight, yield grade and quality grade.
( Sung Im Choi ),( Mee Soo Chang ),( Taeeun Kim ),( Kyung Hwa Chung ),( Seongman Bae ),( Sung-han Kim ),( Chan Jin Yoon ),( Young Kyoon Kim ),( Jun Hee Woo ) 대한내과학회 2021 The Korean Journal of Internal Medicine Vol.36 No.5
Background/Aims: Multi-drug resistant pathogens are increasing among health-care-associated infections. It is well known that copper and copper alloys have antimicrobial activity. We evaluated the activity of copper against bacteria in a hospital setting in Korea. Methods: This study was conducted in a laboratory and medical intensive care unit (ICU). Methicillin resistant Staphylococcus aureus (MRSA) and vancomycin resistant Enterococcus faecium (VRE) were inoculated onto copper, copper alloy and stainless steel plates. After 24 hours of incubation, colony-forming units (CFU) were counted in the laboratory. Two similar rooms were chosen in the ICU; one room had copper-containing surface, and the other room contained items with a stainless steel surfaces. Items were sampled weekly for 8 weeks when the rooms were not crowded and when the rooms were busier with healthcare workers or visitors. Results: In vitro time-kill curves showed copper or, a copper alloy yielded a significant reduction in MRSA and VRE CFUs over 15 minutes. Upon exposure to stain-less steel plates, CFUs were slowly reduced for 24 hours. In vivo, MRSA CFUs were lower in rooms with copper-containing surfaces compared with controls, both after cleaning and after patients had received visitors (p < 0.05). Analysis of VRE revealed similar results, but VRE CFUs from copper-containing surfaces of drug carts in the ICU did not decrease significantly. Conclusions: Copper has antimicrobial activity and appears to reduce the number of multi-drug resistant microorganisms in a hospital environment. This finding suggests the potential of the use of copper fittings, instruments and surfaces in hospital.
Sung-Jin Kim,Kyoon Choi,최세영 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.68 No.6
Transparent conductive films have been widely studied because of their potential applications in optoelectronic devices such as paper displays, dye-sensitized solar cells (DSSCs), organic lightingemitting diodes (OLEDs), organic solar cells and so on. In this paper, we report on a low-resistance, a high-transparents conductive film that can be applied as It a flexible device substrate. In order to the fabricate transparent conductive film, we used a high-resolution roll imprinting method. The following steps were performed: The design and manufacture of an electroforming stamp mold, the fabrication of high resolution roll imprinted on flexible film, and the manufacture of an Ag grid that was filled by using a doctor blade process with a nano-sized Ag paste. Then on patterned Its films, antimony tin oxide was coated with ATO sol solution by using bar the coating method. The fabricated ATO/Ag mesh electrode showed good flexibility, and It exhibited a high optical transmittance of 85.3% in the visible wavelength and a sheet resistance of 41 /sq. Furthermore, the bending test for mechanical properties showed that the ATO/Ag thin film had good flexibility.
Sung, Min Kyung,Bang, Hyoeun,Choi, Jung Kyoon Korea Genome Organization 2014 Genomics & informatics Vol.12 No.4
Genome-wide association studies have proven the highly polygenic architecture of complex diseases or traits; therefore, single-locus-based methods are usually unable to detect all involved loci, especially when individual loci exert small effects. Moreover, the majority of associated single-nucleotide polymorphisms resides in non-coding regions, making it difficult to understand their phenotypic contribution. In this work, we studied epistatic interactions associated with three common diseases using Korea Association Resource (KARE) data: type 2 diabetes mellitus (DM), hypertension (HT), and coronary artery disease (CAD). We showed that epistatic single-nucleotide polymorphisms (SNPs) were enriched in enhancers, as well as in DNase I footprints (the Encyclopedia of DNA Elements [ENCODE] Project Consortium 2012), which suggested that the disruption of the regulatory regions where transcription factors bind may be involved in the disease mechanism. Accordingly, to identify the genes affected by the SNPs, we employed whole-genome multiple-cell-type enhancer data which discovered using DNase I profiles and Cap Analysis Gene Expression (CAGE). Assigned genes were significantly enriched in known disease associated gene sets, which were explored based on the literature, suggesting that this approach is useful for detecting relevant affected genes. In our knowledge-based epistatic network, the three diseases share many associated genes and are also closely related with each other through many epistatic interactions. These findings elucidate the genetic basis of the close relationship between DM, HT, and CAD.
Sang-Hyeok CHO,Yujin JEONG,Seong-Joo HONG,Hookeun LEE,Hyung-Kyoon CHOI,Dong-Myung KIM,Jaemin SEONG,Gahyeon KIM,Choul-Gyun LEE,Suhyung CHO,Byung-Kwan CHO 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.4
Cyanobacteria are able to produce diverse value-added biochemicals from CO<sub>2</sub> and light. To utilize the potency, it is critical to understand the photosynthetic mechanism under various environmental conditions. Here, we investigated the inhibitory mechanisms of photosynthesis under high light and low temperature stress in Synechocystis sp. PCC 6803. Under each stress condition, the transcript abundance and translation efficiency were measured using RNA-seq and Ribo-seq, and the transcription unit architecture was constructed by transcription start sites and transcript 3'-end positions obtained from TSS-seq and Term-seq. Our results suggested that the mode of photosynthesis inhibition differed between the two stress conditions. The poor translation of photosystem I resulted from ribosome stalling at the untranslated regions, affecting the overall photosynthesis under low temperature. Our multi-omics analysis with transcription unit provides foundational information on photosynthesis for future industrial strain development.
Antitumor Components Isolated from the Heartwood Extract of Dalbergia odorifera
Choi, Chun-Whan,Choi, Yeon-Hee,Cha, Mi-Ran,Kim, Young-Sup,Yon, Gyu-Hwan,Kim, Young-Kyoon,Choi, Sang-Un,Kim, Young-Ho,Ryu, Shi-Yong The Korean Society for Applied Biological Chemistr 2009 Applied Biological Chemistry (Appl Biol Chem) Vol.52 No.4
Ongoing search for promising antitumor components from plant resources, we found that the methanol extract from the heartwood of Dalbergia odorifera (Leguminosae) demonstrated a significant inhibition on the proliferation of human tumor cell lines including multidrug resistant cells in vitro. Intensive bioassay-guided purification of the extract finally led to the isolation of seven flavonoids and two phenolic components as active constituents for antitumor property, in vitro, i.e., medicarpin (1), 2-hydroxy-3,4-dimethoxybenzaldehyde (2), formononetin (3), tectorigenin (4), mucronulatol (5), (3R)-5'-methoxyvestitol (6), hydroxyobtustyrene (7), liquiritigenin (8), and (3R)-calussequinone (9), respectively.
Choi, Hong Kyoon,Kim, Mun Ho,Im, Sang Hyuk,Park, O Ok WILEY-VCH Verlag 2009 Advanced Functional Materials Vol.19 No.10
<P>Hexagonally arrayed structures of colloidal crystals with uniform surface are a good candidate for master molds to be used in soft lithography. Here, the fabrication of periodically arrayed nanostructures using poly(dimethylsiloxane) (PDMS) molds based on three-dimensionally (3D) ordered colloidal crystals is reported. A robust, high-quality 3D colloidal-crystal master molds is prepared using the colloidal suspension containing a water-soluble polymer. The surface patterns of the 3D colloidal crystals can then be transferred onto a polymer film via soft lithography, by means of the replication of the surface pattern with PDMS. Various hexagonally arrayed nanostructure patterns can be fabricated, including close-packed and non-close-packed 2D arrays and honeycomb structures by the structural modification of the 3D colloidal-crystal templates. The replicated hexagonally arrayed structures can also be used as templates for producing colloidal crystals with 2D superlattices.</P> <B>Graphic Abstract</B> <P>Various polymeric nanopatterns are fabricated using poly(dimethylsiloxane) replica molds based on high-quality 3D colloidal crystals. Close-packed, non-close-packed, honeycomb-shaped, and superlattice colloidal-crystal patterns are obtained by replicating surface-modified 3D colloidal-crystal master molds (see figure). <img src='wiley_img/1616301X-2009-19-10-ADFM200801096-content.gif' alt='wiley_img/1616301X-2009-19-10-ADFM200801096-content'> </P>